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| Difference in Cadmium, Zinc and Lead Accumulation of Poplar and Willow Species |
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| KeyWord:poplar; willow; Cd; Zn; Pb; accumulation; species difference |
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| Abstract: |
| A soil culture experiment was carried out to investigate the effect of Cd, Zn and Pb combined pollution on biomass, heavy metal concentration and total uptake, bioaccumulation coefficient（ＢＣＦ）, transportation factor（ＴＦ） in 14 poplar and willow species. The results showed there were significant differences among the poplar and willow species in biomass of leaf, stem and root, stem height, heavy metal concentration and total uptake, BCF and TF. With an increase in heavy metal concentration in soil culture, heavy metal concentration and total uptake in poplar and willow species increased significantly, and BCF decreased obviously, whereas TF had almost no change. Heavy metal concentration in Populus× euramericana（Dode）cv. ‘Nanlin-895’（Nanlin 895）, Salix jiangsuensis CL. ‘61-1’（61-1） and Salix jiangsuensis CL. ‘795’（７９５） were very high, the largest Cd and Zn concentration in leaves were detected in 61-1（29.23 mg Cd·kg-1 and 1410 mg Zn·kg-1), but these species showed low metal tolerance and biomass. When biomass and heavy metal concentration were considered together, the heavy metal total uptake of 61-1 and Populus× euramericana（Dode）cv. ‘Nanlin-95’（Nanlin 95） was larger in tested species, enrichment ability of heavy metal in them was stronger, and the largest Cd and Zn total uptake in leaves were detected in Nanlin 95（205.62 μg Cd·plant-1 and 5 897.94 μg Zn·plant-1）. 61-1 and Nanlin 95 hold promise for phytoextraction. |
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